I hired an Uber from the Hilton hotel and it took about 2 hours to get there due to traffic. We left on a Saturday at 11am. The Uber cost 65 PEN. Once at Pachacamac it was apparent that it would be difficult to get a ride for the return trip and the site is suited for you to drive around from ruin to ruin. My advice if you don't go with a package tour is to negotiate one total rate for the drive out, 1 to 2 hours to see the site and then a drive back to Lima.
As for Pachacamac the ruins actually aren't as impressive as the views from Templo Del Sol. You can walk around the temple and see the Pacific Ocean on one side and the Andes Mountains on the other side.
I think the admission was 17 PEN and a tour guide was 25 PEN. From the brochure, the price of a tour guide should have been less but I'm not complaining and I actually gave the tour guide more because she did a great job.
Well worth the trip, just try to manage the time you leave and return to deal with the traffic.
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